package com.hmdp.utils;

import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginInterceptor implements HandlerInterceptor {

//    @Override
//    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//        // 1.判断是否需要拦截（ThreadLocal中是否有用户）
//        if (UserHolder.getUser() == null) {
//            // 没有，需要拦截，设置状态码
//            response.setStatus(401);
//            // 拦截
//            return false;
//        }
//        // 有用户，则放行
//        return true;
//    }


    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //1.获取session
        HttpSession session = request.getSession();
        //2.获取session中的用户
        Object user = session.getAttribute("user");
        //3.判断用户是否存在

//        if (UserHolder.getUser() == null) {
        if (user == null) {
            //4.不存在，拦截，设置状态码
            response.setStatus(401);
            //5.拦截
            return false;
        }

        //5.存在，保存用户信息到ThreadLocal
        UserHolder.saveUser((UserDTO) user);

        //6.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

        //移除用户
        UserHolder.removeUser();
    }
}
